[MemSheriff] Retire unused suppression.

tools/valgrind/memcheck/suppressions.txt

 # There are four kinds of suppressions in this file.
 # 1. third party stuff we have no control over
 #
 # 2. intentional unit test errors, or stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing
 #
 # 3. Suppressions for real chromium bugs that are not yet fixed.
 # These should all be in chromium's bug tracking system (but a few aren't yet).
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 5429 matching lines @@
    fun:_ZN4base10TaskRunner16PostTaskAndReplyERKN15tracked_objects8LocationERKNS_8CallbackIFvvEEES9_
    fun:_ZN4base26PostTaskAndReplyWithResultIN5quota15QuotaStatusCodeES2_EEbPNS_10TaskRunnerERKN15tracked_objects8LocationERKNS_8CallbackIFT_vEEERKNS9_IFvT0_EEE
    fun:_ZN7fileapi21FileSystemQuotaClient16DeleteOriginDataERK4GURLN5quota11StorageTypeERKN4base8CallbackIFvNS4_15QuotaStatusCodeEEEE
    fun:_ZN5quota12QuotaManager17OriginDataDeleter3RunEv
    fun:_ZN5quota9QuotaTask5StartEv
    fun:_ZN5quota12QuotaManager16DeleteOriginDataERK4GURLNS_11StorageTypeEiRKN4base8CallbackIFvNS_15QuotaStatusCodeEEEE
    fun:_ZN7content12_GLOBAL__N_134ClearQuotaManagedOriginsOnIOThreadERK13scoped_refptrIN5quota12QuotaManagerEERKSt3setI4GURLSt4lessIS8_ESaIS8_EENS2_11StorageTypeE
    fun:_ZN7content12_GLOBAL__N_121ClearOriginOnIOThreadEjRK4GURLRK13scoped_refptrIN3net23URLRequestContextGetterEERKS4_IN5quota12QuotaManagerEE
 }
 {
-   bug_258466
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN22ChromeBrowserMainParts25PreMainMessageLoopRunImplEv
-   fun:_ZN22ChromeBrowserMainParts21PreMainMessageLoopRunEv
-   fun:_ZN7content15BrowserMainLoop13CreateThreadsEv
-   fun:_ZN7content21BrowserMainRunnerImpl10InitializeERKNS_18MainFunctionParamsE
-   fun:_ZN7content11BrowserMainERKNS_18MainFunctionParamsE
-   fun:_ZN7content23RunNamedProcessTypeMainERKSsRKNS_18MainFunctionParamsEPNS_19ContentMainDelegateE
-   fun:_ZN7content21ContentMainRunnerImpl3RunEv
-   fun:_ZN7content11ContentMainEiPPKcPNS_19ContentMainDelegateE
-   fun:ChromeMain
-}
-{
    bug_258132a
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN5ppapi5proxy15PPP_Class_Proxy19CreateProxiedObjectEPK18PPB_Var_DeprecatedPNS0_10DispatcherEill
    fun:_ZN5ppapi5proxy24PPB_Var_Deprecated_Proxy27OnMsgCreateObjectDeprecatedEillNS0_24SerializedVarReturnValueE
 }
 {
    bug_258132b
    Memcheck:Leak
    fun:_Znw*
@@ skipping 1020 matching lines @@
    fun:_Znw*
    fun:_ZN7content27ServiceWorkerContextWrapperC1EPNS_14BrowserContextE
    fun:_ZN7content20StoragePartitionImpl6CreateEPNS_14BrowserContextEbRKN4base8FilePathE
    fun:_ZN7content23StoragePartitionImplMap3GetERKSsS2_b
    fun:_ZN7content12_GLOBAL__N_129GetStoragePartitionFromConfigEPNS_14BrowserContextERKSsS4_b
    fun:_ZN7content14BrowserContext19GetStoragePartitionEPS0_PNS_12SiteInstanceE
    fun:_ZN7content14BrowserContext26GetDefaultStoragePartitionEPS0_
    fun:_ZN7content21ShellBrowserMainParts21PreMainMessageLoopRunEv
    fun:_ZN7content15BrowserMainLoop21PreMainMessageLoopRunEv
 }